Add configuration option `CustomTransformPatterns` to `RSpec/SpecFilePathFormat` #1733

Job	Run time
Confirm config and documentation	16s
Test coverage	24s
Edge RuboCop: internal_investigation	15s
RSpec 4	26s
Edge RuboCop: spec	24s
Ruby 2.7: internal_investigation	30s
Ruby 2.7: spec	39s
Ruby 3.0: internal_investigation	18s
Ruby 3.0: spec	24s
Ruby 3.1: internal_investigation	18s
Ruby 3.1: spec	25s
Ruby 3.2: internal_investigation	17s
Ruby 3.2: spec	22s
Ruby ruby-head: internal_investigation	19s
Ruby ruby-head: spec	22s
Ruby jruby-9.4: internal_investigation	1m 25s
Ruby jruby-9.4: spec	1m 28s
	8m 32s

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